Cherry-pick 272448.339@safari-7618-branch (66df5c6). https://bugs.web…

…kit.org/show_bug.cgi?id=267946

    ASSERTION FAILED: watchpoints (./runtime/ScopedArgumentsTable.cpp(130))
    rdar://121446658
    https://bugs.webkit.org/show_bug.cgi?id=267946

    Reviewed by Alexey Shvayka.

    Insatead of using an ASSERT that we have a valid WatchpointSet in ScopedArgumentsTable::trySetWatchpointSet(), we can just
    exit early if the passed in WatchpointSet is null.  This can happen if the JIT is not enabled.

    Updated the test to run both with and wothout the JIT.

    * JSTests/stress/arrow-function-captured-arguments-aliased.js:
    * Source/JavaScriptCore/runtime/ScopedArgumentsTable.cpp:
    (JSC::ScopedArgumentsTable::trySetWatchpointSet):

    Canonical link: https://commits.webkit.org/272448.339@safari-7618-branch

Canonical link: https://commits.webkit.org/266719.402@webkitglib/2.42

JSTests/stress/arrow-function-captured-arguments-aliased.js

@@ -1,3 +1,6 @@
+//@ runDefault
+//@ runNoJIT
+
 function createOptAll(count) {
     count = 0;
 

Source/JavaScriptCore/runtime/ScopedArgumentsTable.cpp

@@ -127,7 +127,9 @@ ScopedArgumentsTable* ScopedArgumentsTable::trySet(VM& vm, uint32_t i, ScopeOffs
 
 void ScopedArgumentsTable::trySetWatchpointSet(uint32_t i, WatchpointSet* watchpoints)
 {
-    ASSERT(watchpoints);
+    if (!watchpoints)
+        return;
+
     if (i >= m_watchpointSets.size())
         return;